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All answers having "Joined together" as clue:

3 Character Answers:

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WED



4 Character Answers:

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KNIT

ONED



5 Character Answers:

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FUSED

YOKED



6 Character Answers:

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BONDED

PIECED

TEAMED

UNITED



7 Character Answers:

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SPLICED



8 Character Answers:

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ATTACHED

COMBINED